Finding the Fourth Proportional to 76,921.80, 115,382.70 and 68,611.20
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Solution
The fourth proportional to 76,921.80, 115,382.70 and 68,611.20 is: 102,916.80
Step by Step Solution
- Step 1: Write the proportion equation
76,921.80 : 115,382.70 = 68,611.20 : x - Step 2: Convert to fraction form
76,921.80/115,382.70 = 68,611.20/x - Step 3: Cross multiply
76,921.80x = 115,382.70 × 68,611.20 - Step 4: Simplify right side
76,921.80x = 7,916,545,506.24 - Step 5: Solve for x
x = 7,916,545,506.24/76,921.80 - Step 6: Final answer
x = 102,916.80
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.